Philly Cheesesteak Shepherd's Pie with Spaghetti Squash Topping

Follow our step-by-step guide on how to make Philly Cheesesteak Shepherd's Pie with Spaghetti Squash Topping.

1. Step 1

   Begin by whisking together light beer, 1/4 cup of olive oil, minced garlic, a couple of dashes of Worcestershire sauce, fresh thyme, red pepper flakes, salt, and black pepper in a mixing bowl.

2. Step 2

   Transfer this flavorful marinade into a resealable plastic bag, add the round steak, seal it tightly, and let it marinate in the refrigerator for 8 hours or overnight for maximum flavor infusion.

3. Step 3

   When ready to cook, remove the steak from the marinade, allowing any excess to drip off, and discard the leftover marinade.

4. Step 4

   Preheat your grill to medium-high heat, lightly oiling the grate to prevent sticking.

5. Step 5

   Also, preheat your oven to 350°F (175°C).

6. Step 6

   Grill the steak for 3 to 4 minutes on each side until it achieves a firm, reddish-pink center, ideally around 130°F (54°C).

7. Step 7

   Once grilled to perfection, let the steak rest before slicing it into 1x1/2-inch strips to retain its juices.

8. Step 8

   For the spaghetti squash, place the halved squash cut-side down on a rimmed baking sheet, adding enough water to reach 1/4 inch up the sides.

9. Step 9

   Bake for approximately 30 minutes or until the squash is tender.

10. Step 10

    After baking, allow it to cool, scoop out the seeds, and use a fork to shred the flesh into a bowl.

11. Step 11

    Combine the shredded squash with a beaten egg for added richness.

12. Step 12

    In a separate bowl, whisk together 1/4 cup of flour, garlic powder, onion powder, salt, and black pepper, then mix this dry blend into the squash.

13. Step 13

    In a large skillet, heat 1 tablespoon of olive oil over medium heat, adding sliced yellow onion, red bell pepper, and yellow bell pepper.

14. Step 14

    Sauté until they begin to brown, about 5 to 10 minutes.

15. Step 15

    Pour in beef broth, add 4 dashes of Worcestershire sauce, and a sprig of fresh thyme, bringing the mixture to a gentle simmer.

16. Step 16

    Gradually stir in 1 tablespoon of flour until the sauce thickens, adding more flour if needed.

17. Step 17

    Fold in the sliced steak and remove from heat.

18. Step 18

    Prepare a 9-inch square casserole dish by spraying it with cooking spray.

19. Step 19

    Spread the savory beef mixture evenly in the dish, then layer the squash mixture on top.

20. Step 20

    Bake in the oven for 30 minutes, then sprinkle shredded Swiss cheese over the squash layer.

21. Step 21

    Increase the oven temperature to 425°F (220°C) and bake until the cheese is golden brown, checking every 5 minutes, which should take about 15 minutes.

22. Step 22

    Enjoy this hearty dish that beautifully combines flavors and textures, perfect for a cozy dinner.